List of Intercounty Baseball League champions
This is a list of past baseball playoff champions of the Intercounty Baseball League, an independent baseball league in Ontario.
The team with most championships are the Stratford Nationals/Kraven Knits/Hillers.
| Year | Winning team | Finalist | Result |
| 1919 | Guelph Maple Leafs | Galt Terriers | |
| 1920 | Guelph Maple Leafs | Galt Terriers | |
| 1921 | Guelph Maple Leafs | Galt Terriers | |
| 1922 | Galt Terriers | Guelph Maple Leafs | |
| 1923 | Galt Terriers | Guelph Maple Leafs | |
| 1924 | Galt Terriers | Guelph Maple Leafs | |
| 1925 | London Cockneys | Preston | |
| 1926 | St. Thomas Elgins | Galt Terriers | |
| 1927 | Galt Terriers | Guelph Maple Leafs | |
| 1928 | Galt Terriers | St. Thomas Elgins | |
| 1929 | Galt Terriers | Twin City Panthers | |
| 1930 | Galt Terriers | Twin City Panthers | |
| 1931 | Galt Terriers | Guelph Maple Leafs | |
| 1932 | Guelph Maple Leafs | Twin City Panthers | |
| 1933 | St. Thomas Elgins | Guelph Maple Leafs | |
| 1934 | Stratford Nationals | London Winery | |
| 1935 | Galt Terriers | Stratford Nationals | |
| 1936 | London Silverwoods | Brantford Red Sox | |
| 1937 | London Silverwoods | Stratford Nationals | |
| 1938 | Stratford Nationals | London Seniors | |
| 1939 | Stratford Nationals | Brantford Red Sox | |
| 1940 | Stratford Nationals | ||
| 1941 | Waterloo Tigers | ||
| 1942 | Stratford Nationals | ||
| 1943 | London Army Team | ||
| 1944 | London Majors | ||
| 1945 | London Majors | ||
| 1946 | Stratford Nationals | ||
| 1947 | London Majors | ||
| 1948 | London Majors | Waterloo Tigers | 4-0 |
| 1949 | Brantford Red Sox | ||
| 1950 | Waterloo Tigers | ||
| 1951 | London Majors | ||
| 1952 | Kitchener Panthers | ||
| 1953 | Kitchener Panthers | Waterloo Tigers | |
| 1954 | St. Thomas Elgins | ||
| 1955 | St. Thomas Elgins | Oshawa Merchants | 4-1 |
| 1956 | London Majors | ||
| 1957 | Kitchener-Waterloo Dutchmen | Listowel Legionnaires | 4-3 |
| 1958 | St. Thomas Elgins | Galt Terriers | 4-3 |
| 1959 | Brantford Red Sox | Galt Terriers | 4-1 |
| 1960 | Brantford Red Sox | Hamilton Cardinals | 4-1 |
| 1961 | Brantford Red Sox | Kitchener Panthers | |
| 1962 | Brantford Red Sox | Galt Terriers | |
| 1963 | Brantford Red Sox | ||
| 1964 | Galt Terriers | London Pontiacs | |
| 1965 | Brantford Red Sox | ||
| 1966 | Galt Terriers | London Pontiacs | 4-2 |
| 1967 | Kitchener-Waterloo Panthers | Guelph Royals | 4-0 |
| 1968 | Kitchener-Waterloo Panthers | ||
| 1969 | London Pontiacs | Stratford Hoods | 4-3 |
| 1970 | Guelph C-Joys | Kitchener Panthers | |
| 1971 | Kitchener Panthers | ||
| 1972 | Toronto Maple Leafs | ||
| 1973 | Kitchener Panthers | ||
| 1974 | Stratford Kraven Knits | ||
| 1975 | London Majors | ||
| 1976 | Stratford Hillers | ||
| 1977 | Stratford Hillers | ||
| 1978 | Hamilton Cardinals | ||
| 1979 | Cambridge Terriers | ||
| 1980 | Stratford Hillers | ||
| 1981 | Brantford Red Sox | ||
| 1982 | Toronto Maple Leafs | ||
| 1983 | Cambridge Terriers | ||
| 1984 | St. Thomas Elgins | ||
| 1985 | Toronto Maple Leafs | ||
| 1986 | Stratford Hillers | ||
| 1987 | Stratford Hillers | ||
| 1988 | Toronto Maple Leafs | ||
| 1989 | Stratford Hillers | ||
| 1990 | Kitchener Panthers | ||
| 1991 | Stratford Hillers | ||
| 1992 | Stratford Hillers | ||
| 1993 | Guelph Royals | ||
| 1994 | Stratford Hillers | Guelph Royals | 4-3 |
| 1995 | Toronto Maple Leafs | Stratford Hillers | 4-3 |
| 1996 | Kitchener Panthers | Toronto Maple Leafs | 4-2 |
| 1997 | Guelph Royals | Toronto Maple Leafs | 4-0 |
| 1998 | Kitchener Panthers | Toronto Maple Leafs | 4-3 |
| 1999 | Toronto Maple Leafs | Kitchener Panthers | 4-3 |
| 2000 | Kitchener Panthers | Guelph Royals | 4-1 |
| 2001 | Kitchener Panthers | Toronto Maple Leafs | 4-3 |
| 2002 | Toronto Maple Leafs | Hamilton Cardinals | 4-1 |
| 2003 | Guelph Royals | Brantford Red Sox | 4-3 |
| 2004 | Guelph Royals | London Majors | 4-1 |
| 2005 | Barrie Baycats | Toronto Maple Leafs | 4-2 |
| 2006 | Brantford Red Sox | London Majors | 4-1 |
| 2007 | Toronto Maple Leafs | Brantford Red Sox | 4-3 |
| 2008 | Brantford Red Sox | London Majors | 4-3 |
| 2009 | Brantford Red Sox | Barrie Baycats | 4-0 |
| 2010 | Brantford Red Sox | Barrie Baycats | 4-2 |
| 2011 | Brantford Red Sox | Ottawa Fat Cats | 4-1 |
| 2012 | Brantford Red Sox | Barrie Baycats | 4-0 |
| 2013 | Brantford Red Sox | Barrie Baycats | 4-3 |
| 2014 | Barrie Baycats | London Majors | 4-0 |
| 2015 | Barrie Baycats | Kitchener Panthers | 4-1 |
| 2016 | Barrie Baycats | Toronto Maple Leafs | 4-0 |
| 2017 | Barrie Baycats | Kitchener Panthers | 4-0 |
| 2018 | Barrie Baycats | Kitchener Panthers | 4-2 |
| 2019 | Barrie Baycats | Kitchener Panthers | 4-2 |
*Source: Intercounty Baseball League 2011 Information Guide & Record Book
Championships by Team
| Team | Number of Championships |
| Barrie Baycats | 7 |
| Brantford Red Sox | 15 |
| Cambridge Terriers | 13 |
| Guelph C-Joys/Maple Leafs/Royals | 9 |
| Hamilton Cardinals | 1 |
| Kitchener Panthers/Dutchmen | 12 |
| London Majors/Pontiacs | 12 |
| St. Thomas Elgins | 6 |
| Stratford Hillers/Kraven Knits/Nationals | 16 |
| Toronto Maple Leafs | 8 |
| Waterloo Tigers | 2 |